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 Differential Equations Ordinary and Partial Differential Equations Math Forum

 December 7th, 2016, 09:30 AM #1 Newbie   Joined: Nov 2016 From: Greece Posts: 14 Thanks: 0 pde I need a hint for this exercise!partial de.jpg
 December 7th, 2016, 09:44 AM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 1,977 Thanks: 1026 I'd assume spherical symmetry and that the neutron density depends only upon $r$ and $t$. You'll have to take the Laplacian in spherical coordinates. See if that gets you anywhere. Thanks from tsam

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